72 PIN SIMM
                                                      COMMODORE 64
Pin Label Description IC-1 IC-2
1 VSS Ground 18   PD2 PD1 Size
2 DQ0 Data 0 2   GND GND 4 or 64 MB
3 DQ16 Data 16     GND NC 2 or 32 MB
4 DQ1 Data 1     NC GND 1 or 16 MB
5 DQ17 Data 17     NC NC 8 MB
6 DQ2 Data 2 15  
7 DQ18 Data 18     PD4 PD3 Access
8 DQ3 Data 3 17   GND GND 50, 100 ns
9 DQ19 Data 19     GND NC 80 ns
10 VCC +5 VDC 9   NC GND 70 ns
11 n/c Not connected     NC NC 60 ns
12 A0 Address 0 14  
13 A1 Address 1 13  
14 A2 Address 2 12  
15 A3 Address 3 11  
16 A4 Address 4 8  
17 A5 Address 5 7  
18 A6 Address 6 6  
19 A10 Address 10    
20 DQ4 Data 4   2
21 DQ20 Data 20    
22 DQ5 Data 5   3
23 DQ21 Data 21    
24 DQ6 Data 6   15
25 DQ22 Data 22    
26 DQ7 Data 7   17
27 DQ23 Data 23    
28 A7 Address 7 10  
29 A11 Address 11    
30 VCC +5 VDC    
31 A8 Address 8    
32 A9 Address 9    
33 /RAS3 Row Address Strobe 3    
34 /RAS2 Row Address Strobe 2    
35 PQ3 Parity bit 3 (for the 3rd byte, bits 16-23)    
         
36 PQ1 Parity bit 1 (for the 1st byte, bits 0-7)    
37 PQ2 Parity bit 2 (for the 2nd byte, bits 8-15)    
38 PQ4 Parity bit 4 (for the 4th byte, bits 24-31)    
39 VSS Ground    
40 /CAS0 Column Address Strobe 0 16  
41 /CAS2 Column Address Strobe 2    
42 /CAS3 Column Address Strobe 3    
43 /CAS1 Column Address Strobe 1    
44 /RAS0 Row Address Strobe 0 5  
45 /RAS1 Row Address Strobe 1    
46 n/c Not connected    
47 /WE Read/Write 4  
48 n/c Not connected    
49 DQ8 Data 8    
50 DQ24 Data 24    
51 DQ9 Data 9    
52 DQ25 Data 25    
53 DQ10 Data 10    
54 DQ26 Data 26    
55 DQ11 Data 11    
56 DQ27 Data 27    
57 DQ12 Data 12    
58 DQ28 Data 28    
59 VCC +5 VDC    
60 DQ29 Data 29    
61 DQ13 Data 13    
62 DQ30 Data 30    
63 DQ14 Data 14    
64 DQ31 Data 31    
65 DQ16 Data 16    
66 n/c Not connected    
67 PD1 Presence Detect 1    
68 PD2 Presence Detect 2    
69 PD3 Presence Detect 3    
70 PD4 Presence Detect 4    
71 n/c Not connected    
72 VSS Ground    
Notes: A9 is a N/C on 256k and 512k modules.
A10 is a N/C on 256k, 512k, 1M and 4M modules.
RAS1/RAS3 are N/C on 256k, 1M and 4M modules.
SIZES AVAILABLE, 72-pin SIMM:
 1MB, 2MB, 4MB, 8MB, 16MB, 32MB, 64MB, 128MB
TESTED & WORKING RAM TYPES/MODELS:-
 "V"   8MB  - VG264400BJ -7 (Double sided 16 x RAM CHIPS per SIMM)
"IBM" 4MB - K20008 PQ  (Single sided 9 X RAM CHIPS)
© THE VORTEX 2007